// Copyright (c) 2012 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.

#include <cstdio>

#include "leveldb/dumpfile.h"
#include "leveldb/env.h"
#include "leveldb/status.h"

namespace leveldb
{
    namespace
    {

        class StdoutPrinter : public WritableFile
        {
        public:
            Status Append(const Slice &data) override
            {
                fwrite(data.data(), 1, data.size(), stdout);
                return Status::OK();
            }
            Status Close() override { return Status::OK(); }
            Status Flush() override { return Status::OK(); }
            Status Sync() override { return Status::OK(); }
        };

        bool HandleDumpCommand(Env *env, char **files, int num)
        {
            StdoutPrinter printer;
            bool ok = true;
            for (int i = 0; i < num; i++)
            {
                Status s = DumpFile(env, files[i], &printer);
                if (!s.ok())
                {
                    std::fprintf(stderr, "%s\n", s.ToString().c_str());
                    ok = false;
                }
            }
            return ok;
        }

    } // namespace
} // namespace leveldb

static void Usage()
{
    std::fprintf(
        stderr,
        "Usage: leveldbutil command...\n"
        "   dump files...         -- dump contents of specified files\n");
}

int main(int argc, char **argv)
{
    leveldb::Env *env = leveldb::Env::Default();
    bool ok = true;
    if (argc < 2)
    {
        Usage();
        ok = false;
    }
    else
    {
        std::string command = argv[1];
        if (command == "dump")
        {
            ok = leveldb::HandleDumpCommand(env, argv + 2, argc - 2);
        }
        else
        {
            Usage();
            ok = false;
        }
    }
    return (ok ? 0 : 1);
}
